code: def test_default(self):
      expected_key = "_transforms"
      a = _TraceTest()
      for x in a.transform_info_keys():
          self.assertTrue(x in a.get_transform_info())
      self.assertEqual(a.trace_key(), expected_key)
  
      data = {"image": "test"}
      data = a(data)  # adds to the stack
      self.assertTrue(isinstance(data[expected_key], list))
      self.assertEqual(data[expected_key][0]["class"], "_TraceTest")
  
      data = a(data)  # adds to the stack
      self.assertEqual(len(data[expected_key]), 2)
      self.assertEqual(data[expected_key][-1]["class"], "_TraceTest")
  
      with self.assertRaises(IndexError):
          a.pop({"test": "test"})  # no stack in the data
      data = a.pop(data)
      data = a.pop(data)
      self.assertEqual(data[expected_key], [])
  
      with self.assertRaises(IndexError):  # no more items
          a.pop(data)
  
file_path: MONAI/tests/test_traceable_transform.py
imports: from __future__ import annotations
  import unittest
  from monai.transforms.inverse import TraceableTransform
label_desc: Use image node_id 1 for calling the TestTraceable obj's underlying member method code with example usage: obj.test_default() without return types